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UC3842B-S08-R bảng dữ liệu(PDF) 7 Page - Unisonic Technologies

tên linh kiện UC3842B-S08-R
Giải thích chi tiết về linh kiện  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
PDF  11 Pages
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nhà sản xuất  UTC [Unisonic Technologies]
Trang chủ  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

UC3842B-S08-R bảng dữ liệu(HTML) 7 Page - Unisonic Technologies

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UC3842B/3843B
LINEAR INTEGRATED CIRCUIT
UNISONICTECHNOLOGIESCO.,LTD
7 of 11
www.unisonic.com.tw
QW-R103-012.D
APPLICATION INFORMATION(Cont.)
Current Sense Circuit
Peak current (IS) is equaled:
IS(MAX)=1.0V/RS
There should be a small RC filter to suppress switch transients.
Oscillator Waveforms and Maximum Duty Cycle
8
5
4
VREF
RT/RC
GND
CT
RT
INTERINAL CLOCK
INTERINAL CLOCK
V4
V4
LARGE RT
SMALL CT
SMALL CT
LARGE RT
CT (Oscillator timing capacitor) can be charged by VREF through RT and discharged by an internal current source. At
discharge time, the internal clock signal blanks the output to the low. Both oscillator frequency and maximum duty
cycle can be determined by Selection of RT and CT. All charge and discharge times can be calculated by the next
formulas:
tC=0.55 RT CT
tD=RTCTIn
⎟⎟
⎠
⎞
⎜⎜
⎝
⎛
−
−
4
0.0063R
2.7
0.0063R
T
T



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